<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width; initial-scale=1.0">
  <title>Sanity touch-tapping test</title>
  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
  <script type="application/javascript" src="apz_test_utils.js"></script>
  <script type="application/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
  <script type="application/javascript">

function startTest() {
  if (window.scrollY == 0) {
    // the scrollframe is not yet marked as APZ-scrollable. Mark it so and
    // start over.
    window.scrollTo(0, 1);
    waitForApzFlushedRepaints(startTest);
    return;
  }

  // This is a scroll by 20px that should use paint-skipping if possible.
  // If paint-skipping is enabled, this should not trigger a paint, but go
  // directly to the compositor using an empty transaction. We check for this
  // by ensuring the document element did not get painted.
  var utils = window.opener.SpecialPowers.getDOMWindowUtils(window);
  var elem = document.documentElement;
  var skipping = location.search == '?true';
  utils.checkAndClearPaintedState(elem);
  window.scrollTo(0, 20);
  waitForAllPaints(function() {
    if (skipping) {
      is(utils.checkAndClearPaintedState(elem), false, "Document element didn't get painted");
    }
    // After that's done, we click on the button to make sure the
    // skipped-paint codepath still has working APZ event transformations.
    clickButton();
  });
}

function clickButton() {
  document.addEventListener('click', clicked, false);

  synthesizeNativeTap(document.getElementById('b'), 5, 5, function() {
    dump("Finished synthesizing tap, waiting for button to be clicked...\n");
  });
}

function clicked(e) {
  is(e.target, document.getElementById('b'), "Clicked on button, yay! (at " + e.clientX + "," + e.clientY + ")");
  subtestDone();
}

waitUntilApzStable().then(startTest);

  </script>
</head>
<body style="height: 5000px">
 <div style="height: 50px">spacer</div>
 <button id="b" style="width: 10px; height: 10px"></button>
</body>
</html>
